Device for closing the idle fuel supply in a carburetor for an internal combustion engine



y 1, 1967 A. s. OZERSKY 3,330,544

DEVICE FOR CLOSING THE IDLE FUEL SUPPLY IN A CARBURETOR United States Patent 3,330,544 DEVICE FOR CLOSING THE IDLE FUEL SUPPLY IN A CARBURETOR FOR AN INTERNAL COM- BUSTION ENGINE Arkady Solomonovich Ozersky, Moscow, U.S.S.R., assignor to Moskovsky Zavod avtomobiljnykh priborov, Moscow, U.S.S.R.

Filed Dec. 28, 1964, Ser. No. 421,180 3 Claims. (Cl. 261--41) This invention relates to devices for shutting off the idle fuel supply system to the carburetor in internal combustion engines.

Known devices for shutting off the idle fuel supply to the carburetor in an internal combustion engine are provided with a shut-off unit directly operated by the vacuum produced in the engine intake pipe during controlled idling.

The main disadvantages of such devices lie in the fact that, in order to provide for stable performance of the shut-off unit at the predetermined inst-ant, such devices have to be highly sensitive, inasmuch as the pressure differential required for complete operation of the shutoff unit proves to be very slight due to slow increase in the vacuum produced in the intake pipe within the speed range of controlled idling r.p.m.

Apart from the above, such devices require frequent adjustment in service.

An object of the present invention is to provide a device which eliminates the above disadvantages.

A further object of the present invention is to provide a device whose shut-01f unit will be put in and out of operation with acceptable stability of timing.

According to the invention, these objects are achieved by placing the shut-off unit in communication with a pressure regulator mounted on the engine intake pipe, said pressure regulator providing for continuous admission of additional air flow into the intake pipe and consequent utilization of the jet effect of said air flow for operating the shut-off unit at low settings of the carburetor throttle valve.

Thus, in accordance with the invention, the device for shutting off the idle fuel supply in a carburetor for an internal combustion engine meets the requirements of present-day engineering, since it provides for the shutoff unit to be put in or out of operation completely and substantially instantaneously at the very commencement of imparting an impulse to the shut-off unit and without increase in the intake pipe vacuum differential, stable timing of said shut-off unit being ensured.

Apart from the aforesaid, the use of the present invention eliminates toxicity of waste gases, prevents dilution of the lubricating oil film by unburned fuel and, owing to a considerable decrease in the intake pipe vacuum, reduces oil consumption, carbonization and smoking due to burning of oil.

An embodiment of the invention is shown in the accompanyin-g drawing.

The device comprises a pressure regulator 1 with a spring-loaded valve 2 and two variable-volume chambers 3 and 4. Chamber 3 communicates with outlet passage 6 through nozzle 5. Chamber 4 communicates with the space at the inlet of valve 2 via conduit 11, while air line 7 connects chamber 4 with shut-off unit 8 on carburetor 9.

When the suction pressure in intake pipe 10 reaches a predetermined value, valve 2 opens slightly. Owing to the ejecting action of the air flow, pressures in chambers 3- and 4 vary, which gives rise to a supplementary force opening valve 2 and holding it open at a pressure differential below that otherwise required for opening the valve.

The vacuum produced in chamber 4 from the moment of opening of valve 2 acts through air line 7 upon shutoff unit 8, thereby activating the latter.

Thus, fuel supply is discontinued or started synchronously with opening or closure of valve 2.

The shut-olf unit will also operate in the manner described hereinbefore if the end of pipe line 7 is put in communication with the space at the inlet of valve 2.

What is claimed is:

1. A device for closing the idle fuel supply in a carburetor for an internal combustion engine, said device comprising: means for closing the idle fuel supply in a carburetor, a pressure regulator adapted for being mounted on an intake manifold of an internal combustion engine, said regulator having an outlet in communication with said manifold and subjected to suction pressure therein and an inlet for atmospheric air, said regulator comprising a spring loaded valve member controlling communication between said inlet and outlet, said regulator having a chamber in continuous communication with said manifold to regulate opening and closing of the valve member in response to pressure variation in said manifold, said regulator including means defining a passageway from the inlet to said manifold with the valve member open such that the flow of air from the inlet to the manifold subjects the valve member to a force urging the valve member to open position and supplementing the action of the suction pressure in said chamber, and means providing communication between the inlet air and the means which closes the idle fuel supply to activate the latter when the valve member is open and the pressure of the inlet air is reduced.

2. A device as claimed in claim 1, wherein said air inlet and said passageway from the inlet to the manifold are disposed in entirety beneath the valve member.

3. A device as claimed in claim 2, wherein said regulator has a second chamber in isolation from said first chamber and in communication with said air inlet and said means which closes the idle fuel supply.

References Cited UNITED STATES PATENTS 2,3863 40 1 0/ 1945 Olson. 2,415,491 2/ 194-7 H-ieger. 2,824,726 2/ 195 8 Dietrich et al. 2,868,621 1/ 1959 Dietrich.

HARRY B. THORNTON, Primary Examiner. T. R. MILES, Assistant Examiner. 

1. A DEVICE FOR CLOSING THE IDLE FUEL SUPPLY IN A CARBURETOR FOR AN INTERNAL COMBUSTION ENGINE, SAID DEVICE COMPRISING: MEANS FOR CLOSING THE IDLE FUEL SUPPLY IN A CARBURETOR, A PRESSURE REGULATOR ADAPTED FOR BEING MOUNTED ON AN INTAKE MANIFOLE OF AN INTERNAL COMBUSTION ENGINE, SAID REGULATOR HAVING AN OUTLET IN COMMUNICATION WITH SAID MANIFOLD AND SUBJECTED TO SUCTION PRESSURE THEREIN AND AN INLET FOR ATMOSPHERIC AIR, SAID REGULATOR COMPRISING A SPRING LOADED VALVE MEMBER CONTROLLING COMMUNICATION BETWEEN SAID INLET AND OUTLET, SAID REGULATOR HAVING A CHAMBER IN CONTINUOUS COMMUNICATION WITH SAID MANIFOLD TO REGULATE OPENING AND CLOSING OF THE VALVE MEMBER IN RESPONSE TO PRESSURE VARIATION IN SAID MANIFOLD, SAID REGULATOR INCLUDING MEANS DEFINING A PASSAGEWAY FROM THE INLET TO SAID MANIFOLD WITH THE VALVE MEMBER OPEN SUCH THAT THE FLOW OF AIR FROM THE INLET TO THE MANIFOLD SUBJECTS THE VALVE MEMBER TO A FORCE URGING THE VALVE MEMBER TO OPEN POSITION AND SUPPLEMENTING THE ACTION OF THE SUCTION PRESSURE IN SAID CHAMBER, AND MEANS PROVIDING COMMUNICATION BETWEEN THE INLET AIR AND THE MEANS WHICH CLOSES THE IDLE FUEL SUPPLY TO ACTIVATE THE LATTER WHEN THE VALVE MEMBER IS OPEN AND THE PRESSURE OF THE INLET AIR IS REDUCED. 